Utility tooth rest



Jan. 30, 1945- A. A. LEBERMANN UTILITY TOOTH REST Filed June 29, 1943 3 Sheets-Sheet l AALeberm grwmvho o an,

Jan. 30, 1945. A. A. LEBERMANN UTILITY TOOTH REST r Filed June 29, 1945 a Sheets-Sheet 2 INVENTOR. AJL Lebgrm nrb,

ATTdRNEK Jan. 30, 1945. LEBERMANN 2,368,225-

' UTILITY TOOTH REST Filed Jun 29, 1943 3 Sheets-Sheet 3 INVENTOR. AJL Leber'manrv,

TTOR ma Patented Jan. 30, 1945 UNITED STATES PATENT OFFICE UTILITY TOOTH REST August A. Lebermann, Highland Park, Mich.

Application June 29, 1943, Serial No. 492,741

Claims.

lated with respect to the base of the wheel guard permitting ready adjustment of the rest to compensate for wheel wear.

It is a further object of the invention to provide a wheel guard in which the upper portion thereof is hingedly mounted upon the base of the guard, the walls of the hood and base having bevelled meeting edges, and having a spring catch for holding the hood in normally closed relation, avoiding possibility of accidental opening of the hood due to breakage of the grinder wheel, thus providing a safety feature protecting the operator.

It is also an object of the invention to provide a wheel guard in which a. dust tube may be readily installed for withdrawal of metal grinding. dust and the like, and in which a lower catch pan is provided for gathering dust particles when the grinding wheel is running in a clockwise direction, an extensible hood portion taking care of dust particles when the grinding wheel is driven in a counter-clockwise direction.

It is a still further object of the invention to provide a novel construction of tooth rest post so constructed as to permit interchange of varying types of rests.

Additional objects, advantages and features of invention will be apparent from the following description and accompanying drawings, wherein Figure l is a side elevation of the combined guard and tooth rest,

Figure 2 is a vertical section therethrough on the line 2-2 of Figure 4.

Figure 3 is an end elevation.

Figure 4 is a top plan view.

Figure 5 is a side elevation of a conventional type of tool grinder having my guard and rest installed.

Figure 6 is a fragmentary perspective illustrating my attachment installed upon a tool grinder. Figure 7 is a perspective view of a tooth rest and support post.

Figure 3 is amodified form of tooth rest and post.

Figure 9 is a front elevation thereof, partly in section.

Figure 10 is a front elevation of a rest constructed for left hand support of a tooth.

Figure 11. is a similar view of a rest for right hand support of a tooth.

Figure 12 is a modified form of rest for left hand support of a tooth.

Figure 13 is a similar view of rest for right hand-support of a tooth.

Figure 14 is a perspective view of the tooth rest shown in conjunction with Figures 1 to 6.

Figure 15 is a perspective view of a block employed in the mounting of the modified form of tooth rest.

Figure 16 is a cross section (through a portion of tllie wheel guard, on the line I 6-l 6 of Figure Reference is first made to Figures 1 to 6 inclusive, wherein there is shown my combined dust guard and tooth rest, generally indicated by the reference character ID.- The guard .comprises a base member I l of substantially rectangular form as seen in plan, the forward end thereof being formed with a longitudinal slot 2 for reception of a tooth rest post, as will be presently explained. The slot I2 is of substantial length and terminates approximately in line with the axis of the grinding wheel arbor, as may be seen in Figure 1, and at this point the base member H is formed as a tubular member l3, the upper portion of which is open as at it (see Fig. 2). Upright parallel side walls l5 are integrally formed with the member 13 connected at their rear ends byv a wall l6, which will be noted stops short of the upper edges of the side walls 15 and extends inwardly between the .side walls for a distance andthence upwardly, terminating flush with the upper edges of the side walls. Thus a recess I! is formed between the rear wall and the side walls, the latter being provided with aligned openings for a pivot pin It! for hingedly mounting a wheel guard H3. The height of the side walls are preferably such as to stop on a line with the axis of the grinding wheel arbor and are spaced apart laterally a distance so as to readily accommodate various widths of grinding wheels.

The wheel guard I0 is in the form of a segment of a circle the side walls 20 of which are spaced so as to align with the side walls l5 of the base member H so as to rest upon the upper edges thereof, when in closed or operative position. The side walls l5 and 20 are axially cut away as at 2|, and the walls 20 terminate on a line through the axis of the grinding arbor at approximately degrees; providing'ample clearance for grinding operations and yet housing the grinding wheel to such 'extentthat metal grindings, dust and the'like will not be permitted to escape into the atmosphere,

In order that the hood 19 may be releasably secured to the base member H, a spring catch 22 is employed, which in the present instance is a flat leaf spring anchored to one of the side walls l5. as at 23. The spring is vertically positioned and extends beyond the meeting edges of the walls l5 and 2D. The wall is formed with an opening 24 for reception of a lug 25 fixed upon the free end of the spring. Attention is invited to Figure 16 where it will be seen that the upright walls I5 of the base are bevelled and the walls 20 of the hood are also bevelled, but in an opposite direction. Thus, when the hood is in closed position upon the base the bevelled edges 13 of the walls will be in snug contacting engagement, preventing lateral movements as well as functioning as a guide to insure proper seating of the hood upon the base.

The attachment has been illustrated as applicable to a Cincinnati #2 grinding machine, indicated by the reference character 26, the table 27 of the grinding head of which is provided at the rear thereof with a pair of T-shaped slots 28. These slots 28 and the table 21 function in the support of my attachmenaas will be described.

Adjacent the rear of the base member II and extending at right angles thereto a plate 29 is integrally formed, of a length so as to extend across the slots 28 and lie flush upon the bed plate 21.. As may be seen from Figure 3, the bottom wall of the plate 29 lies in a plane in line with the longitudinal axis of the tubular member l3 which will position the attachment at a proper height with respect to the grinding head.

A pair of keys 30 are suitably secured to the under side of the plate :29 so positioned as to be received in the T-slot '28, and a pair of bolts 3! extended through apertures 32 .of the plate 29 and the table 21 rigidly mounts the attachment to the grinding head and in proper position with respect to the grinding wheel (see Fig. 6 of the drawings)., In order to provide ample rigidity between the body or base member II and the attaching plate 29, upstandingreinforcing flanges 33-33 are provided, the former extending from approximately the medial portion of the base II to a point well outwardly of the plate 29. The flange 33 is preferably located at the end of the base II and extends outwardly upon the plate 29 a suitable distance.

In certain cases of grinding, it is desirable to have the wheel guard overlie the work rather closely, and this is accomplished in the provision of an auxiliary shield '34. The shield consists of an arcuate-shaped trough having an open rear end 35 and a forwardly extended front end 36. The side walls L31 of the trough are spaced apart so as to slidably engage upon the hood I 5 and the top wall 38 is provided with elongated slots 39. At suitable points, the hood 1-9 is apertured and tapped for reception of screws 40 which pass through respective slots 39. A helical spring 4| is interposed between the head of the screw and the wall .38 of the shield. It will be seen that the shield may be .moved forwardly :and rearwardly about the periphery of the wheel guard according to the length of the slots and the springs 4| afford sufiicient friction to hold the shield in a desired position.

The tubular member 13 is formed with an interiorly [tapered surface as indicated at 42, permitting ready connection .of a suction hose (not shown), Ior withdrawing grinding dust and the like-developedby grinding operations and in order that substantially, if not .all, :such dust will be directed to the suction Lhose, a pan-like device 43 is employed, mounted upon the attachment by means of the tooth rest post, as will now be described.

The tooth rest post is indicated at 43, and comprises a lower exteriorly threaded stud portion 44, recessed at diametrically opposite sides forming flat faces 45 of a width to be slidably engaged in the slot l2 of the base member H. The upper end of the stud portion 44 is provided with a pair of laterally spaced uprights 4B, the height of the uprights being such as to terminate on a line coincident with the axis of the grinding wheel when in operative position, although the post 43 may be vertically adjusted, if desired, as will be explained. The uprights 46 are spaced apart a suflicient distance to accommodate the varying thicknesses of grinding wheels. The bight portion 41 formed between the uprights is inclined in the direction of the tubular member I3, for a purpose to be explained.

Adjacent the upper ends of the uprights 46, respective slots 48 are formed upon the outer front face of the uprights and the upper fiat end of the uprights have threaded bores intersecting respective slots for mounting of suitable machine screws 49 which terminate flush with the upper ends of the uprights so as to avoid any projecting portions. A tooth rest 50 is provided, which is specifically shown in Figures 7 and 14, comprises a pair of rectangular blocks 5| of dimensions to have sliding fit within respective slots 48. The outer ends of the blocks are formed with forwardly and upwardly directed arms 52 diverging toward each other and forming a juncture at a point medially of the space between the uprights 46, the juncture indicated at 53 forming the tooth support. It will be seen that by thus forming the arms-'52 a substantially V-shaped rest is provided with clearance upon each side of the tooth support 53.

It will be understood that the rest 50 is mounted upon the uprights by merely presenting the blocks within the slots 48 and tightening the screws 49, the spacing of the blocks being the same as the distance between the uprights, the tooth support 53 will be properly centered between the uprights. It will also be noted that the upper end of the tooth support 53 terminates on a line with the upper'ends of the uprights 46 and will therefore be on a line with the axis of the grinding wheel.

In order that the tooth post 43 may be adjustably mounted within the slot I 2 of the base, a pair of knurled nuts 54 are engaged upon the upper threaded portion of the stud portion 44, the

lower nut resting flush upon the upper face of the base member ii and of a diameter to extend beyond the edges of the slot l'2. A similar nut 55 is engaged upon the lower end of the threaded stud portion, adapted to engage the underside of the base member I l It will be apparent that vertical adjustment of the rest is made possible by adjusting the nuts 54 'to a desired height and then tightening the lower nut 55. Also longitudinal adjustment of the rest along the slot [2, to accommodate different diameters of grinding wheels is inherent, as will be readily understood.

As best seen in Figure 2, the pan-like device 43 embodies a bottom wall 56 and side walls 51 is spaced apart a distance so as to be presented between the walls l5 of the wheel guard so as to present the discharge end 58 within the tubular member I3. The pan also includes an inclined forward end 59 of a width so as to pass between the uprights 46 of the tooth rest 43. The bottom wall 56 extends forwardly of the pan device and is slotted as at 60, so as to pass about the threaded stud portion 44 of the tooth rest. By this construction it will be seen that when the nuts 54 and 55 are tightened, the pan will be securely held in position to receive material ground from a tool being worked upon as well as abrasive material loosened from the grinding wheel.

In order that all material loosened during grinding operation will be directed into the pan 43, a chute BI is employed which consists of a base plate 62, integral side walls 63 and an upright front end wall 64. The base plate 62 is of a width to pass freely between the uprights 46 of the tooth rest and of a length so as to overlap the wall 59 of the pan-like device 43. Upon the under side of the base plate 62 a spring clamping arm 65 is secured, the forward end being spaced from the plate 62 so as to receive the upper end of the plate 59 therebetween. Thus the chute 6| is detachably mounted for ready removal as may be required in certain types of grinding.

The post 43 is intended to support different types of tooth rests, such as illustrated in Figures 8 to 11, the rests in these instances consisting of a thin, rectilinear spring 66. The post 43 is formed with an inclined slot 61 into which the lower end of the spring may be inserted. A tapped bore 68 intersecting the slot 61 admits a suitable screw for retention of the spring. However, since the spring is of a flexible character, support means at its upper end must be provided and as shown, consists of a rectangular block 69 having a slot NJ in one face thereof into which an edge of the spring is positioned. When using this type of tooth rest, the rest 50 is removed from the post and respective blocks 69 are disposed in the slots 48 of the post and secured, the spring 66 being disposed within the slots '19 as shown. This type of tooth support is admirably suited for grinding fine teeth of cutting tools since the grinding wheel will be admitted into much closer relation to the work.

In Figure 10, the tooth rest 66 is shown as having an inclined upper edge H, permitting left hand grinding of a tooth, while in Figure 11, the edge is reversely inclined for right hand grindmg.

A modified form of the tooth rest post is shown in Figures 12 and 13, which consists of a single upright 46, and having a tooth rest 12. Figure 12, the upright 46' is positioned upon the left side while in Figure 13 the upright is at the right hand side, permitting left and right grinding, respectively.

The form of rest in which a spring is employed, permits the grinding of very fine fluted reamers and similar cutting tools, since the rest may be adjusted up close to the grinding wheel, allowing the wheel to grind the tooth rest to the desired thickness and thus accommodate any shallow fiuted tools.

The attachment may be used not only for peripheral grinding of cutters, but side. face and end mills, as well.

It will be apparent that from the simplicity of attaching the device and the certainty of maintaining adjustment of an original set up, thorough grinding of approximately 80 percent of all milling machine cutters can be accomplished,

and in addition, a keener cutting edge will be produced, by reason of the rigid support of the rest.

In use, it will be seen that grindings removed from a cutting tool will fall into the chute 5i and pan device 43 from whence it will be drawn through the element l3 by reason of suction applied at the end 42 thereof.

While I have shown and specifically described the invention, this is by way of illustration only, and I consider as my own, all such modifications in construction as fairly fall within the scope of the appended claims.

I claim:

1. A tooth rest post for tool grinders comprising a threaded stud having an adjusting nut and lock nut and a clamping nut therebelow, spaced uprights on the stud, each upright having a slot formed adjacent the upper end, said slots being in alignment, each upright having a threaded bore intersecting the slot, and a bifurcated tooth rest having portions complemental to respective slots and screw means engaged in each bore adapted to contact and retain the portions disposed within the slots.

2. The structure of claim 1 in which the tooth rest consists of block members complemental to the slots, said block members each having anarm diverging upwardly to a point of juncture medially between said uprights.

3. A tooth rest post for tool grinders comprising a threaded stud having an adjusting nut and a lock nut and clamping nut therebelow, spaced uprights on the stud, each upright having a slot formed adjacent the upper end, said slots being in alignment, each upright having a threaded bore intersecting the slot, said stud having a slot adjacent the base of the uprights and medially thereof, a threaded bore intersect-' ing said slot, a. fiat leaf spring disposed within the slot, a screw member in said threaded bore adapted to impinge upon said spring, a block member engaged in respective slots of the uprights, each block having a vertical slot for reception of said leaf spring therethrough, a screw engaged in each bore of said uprights for retention of said block members, and said leaf spring having an inclined upper tooth supporting surface.

4. A tooth rest post for tool grinders comprising a threaded stud having an adjusting nut and a lock nut and a clamping nut therebelow, an upright on the stud positioned upon one side of the vertical axis thereof, said stud having a slot adjacent the upper end thereof, a tooth rest having a block member complemental to the slot, a threaded bore intersecting the slot, and a screw member engaged in said bore adapted to impinge upon said block.

5. A tooth rest post for tool grinders'com'prising a threaded stud having means for adjustably mounting said stud upon a grinder base, spaced uprights on the stud, each upright having a slot formed adjacent the upper end, said slots being in alignment for mounting of a tooth rest support, means for securing the tooth rest support in the slots, said stud having a slot adjacent the base of the uprights and positioned medially thereof, a threaded bore intersecting said slot, and a screw member in said threaded bore.

AUGUST A. LEBERMANN. 

